A Survey of Food Allergies in a Simple Random Sample

Multiple Choice

A survey of food allergies in a simple random sample of 184 young children found that 13 had some kind of food allergy. Why should we use the plus four method to compute a 95% confidence interval for the population proportion of young children who have a food allergy?

A) The counts of successes and failures in the sample are too small for the large-sample method.
B) The sample size is too small for the large-sample method.
C) We do not know sigma, the population standard deviation.
D) We do not know the population proportion of young children who have a food allergy.